Sewellel \Se*wel"lel\, n. [Of American Indian origin.] (Zool.)
A peculiar gregarious burrowing rodent ({Haplodon rufus}),
native of the coast region of the Northwestern United States.
It somewhat resembles a muskrat or marmot, but has only a
rudimentary tail. Its head is broad, its eyes are small and
its fur is brownish above, gray beneath. It constitutes the
family {Haplodontidae}. Called also {boomer}, {showt'l}, and
{mountain beaver}.
[1913 Webster]